FR2846077A1 - Heat exchange apparatus upstream of cryogenic gas distillation plant has outlet to extract first flow from intermediate level in first body - Google Patents

Heat exchange apparatus upstream of cryogenic gas distillation plant has outlet to extract first flow from intermediate level in first body Download PDF

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Publication number
FR2846077A1
FR2846077A1 FR0350905A FR0350905A FR2846077A1 FR 2846077 A1 FR2846077 A1 FR 2846077A1 FR 0350905 A FR0350905 A FR 0350905A FR 0350905 A FR0350905 A FR 0350905A FR 2846077 A1 FR2846077 A1 FR 2846077A1
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France
Prior art keywords
flow
intermediate level
sending
bodies
gas mixture
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Pending
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FR0350905A
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French (fr)
Inventor
Frederic Judas
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Application filed by Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Priority to FR0350905A priority Critical patent/FR2846077A1/en
Publication of FR2846077A1 publication Critical patent/FR2846077A1/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
    • F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
    • F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04296—Claude expansion, i.e. expanded into the main or high pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The heat exchange apparatus consists of at least two bodies (1, 2) with feeds for delivering two flows (11, 5) of a gas mixture to the two bodies under pressure and delivering them after cooling to the cryogenic separating plant. At least two fluids are drawn from the separating plant and fed back to the heat exchanger bodies, which incorporate a system for drawing a first flow at an intermediate level in the first body and mixing it with a second flow that has been cooled in the second body. The apparatus includes an expansion turbine (15) and a system for sending a second flow drawn from an intermediate level in the second body, the difference in temperature in the intermediate levels of the two bodies being not more than 10 deg K, and preferably not more than 5 deg K.

Description

La présente invention est relative à l'appareil d'échange de chaleur enThe present invention relates to the heat exchange apparatus in

amontuphill

d'une installation de séparation par distillation cryogénique, une installation de séparation par distillation cryogénique incorporant un tel appareil et un procédé de refroidissement du mélange gazeux destiné à être séparé dans une installation de 5 séparation par distillation cryogénique. En particulier, elle concerne les appareils d'échange utilisant au moins deux corps d'échangeur.  a cryogenic distillation separation plant, a cryogenic distillation separation plant incorporating such an apparatus and a method of cooling the gas mixture intended to be separated in a cryogenic distillation separation plant. In particular, it relates to exchange devices using at least two exchanger bodies.

L'invention s'applique particulièrement à la séparation de l'air et à la séparation des mélanges composés principalement d'hydrogène, de monoxyde de  The invention is particularly applicable to the separation of air and to the separation of mixtures composed mainly of hydrogen, monoxide of

carbone et de méthane.carbon and methane.

Un but de la présente invention est d'optimiser les diagrammes d'échange pour un appareil d'échange de chaleur à au moins deux corps et de diminuer la consommation d'énergie d'un appareil de séparation utilisant un tel appareil  An object of the present invention is to optimize the exchange diagrams for a heat exchange device with at least two bodies and to reduce the energy consumption of a separation device using such a device.

d'échange de chaleur pour refroidir le gaz destiné à y être séparé.  heat exchange to cool the gas to be separated there.

Selon un objet de l'invention, il est prévu un appareil d'échange de chaleur en 15 amont d'une installation de séparation d'un mélange gazeux par distillation cryogénique comprenant au moins deux corps d'échangeur de chaleur, des moyens pour envoyer un premier débit du mélange gazeux à un premier des au moins deux corps à une pression P, des moyens pour envoyer un deuxième débit du mélange gazeux à un deuxième des au moins deux corps à une pression P, des moyens pour 20 envoyer les premier et deuxième débits de mélange gazeux refroidis à l'installation de séparation, des moyens pour soutirer au moins deux fluides de l'installation de séparation et des moyens pour envoyer au moins un de ces fluides au premier corps et au moins un de ces fluides au deuxième corps caractérisé en ce qu'il y a des moyens pour sortir le premier débit à un niveau intermédiaire du premier corps et des 25 moyens pour mélanger ce débit avec le deuxième débit qui s'est refroidi dans le  According to an object of the invention, there is provided a heat exchange device upstream of an installation for separation of a gas mixture by cryogenic distillation comprising at least two heat exchanger bodies, means for sending a first flow of the gas mixture to a first of the at least two bodies at a pressure P, means for sending a second flow of the gas mixture to a second of the at least two bodies at a pressure P, means for sending the first and second gas mixture flow rates cooled at the separation installation, means for withdrawing at least two fluids from the separation installation and means for sending at least one of these fluids to the first body and at least one of these fluids to the second body characterized in that there are means for withdrawing the first flow at an intermediate level from the first body and means for mixing this flow with the second flow which has cooled in s the

deuxième corps.second body.

Selon d'autres aspects facultatifs, l'appareil comprend - des moyens pour introduire ledit premier débit de mélange gazeux, soutiré  According to other optional aspects, the apparatus comprises - means for introducing said first flow of gas mixture, withdrawn

du premier corps, à un niveau intermédiaire du deuxième corps et des moyens pour 30 sortir le débit du mélange gazeux du deuxième corps.  of the first body, at an intermediate level of the second body and means for outputting the flow of the gas mixture from the second body.

- une turbine de détente et des moyens pour y envoyer le deuxième débit soutiré à un niveau intermédiaire du deuxième corps, la différence de température entre le niveau intermédiaire de soutirage du deuxième corps du débit destiné à la turbine et le niveau intermédiaire du premier corps du premier débit soutiré étant au  an expansion turbine and means for sending there the second flow withdrawn to an intermediate level of the second body, the temperature difference between the intermediate level of withdrawal of the second body of the flow intended for the turbine and the intermediate level of the first body of the first flow withdrawn being at

plus 10K, de préférence au plus 5K.  plus 10K, preferably at most 5K.

- des moyens pour envoyer au moins un débit de mélange gazeux à pression différente de P au premier corps et des moyens pour envoyer au moins un débit de mélange gazeux à pression différente de P au deuxième corps. De préférence, (seul) le premier corps est conçu pour pouvoir supporter de fortes pressions et l'appareil comprend des moyens pour y envoyer au moins un  - Means for sending at least one flow of gas mixture at a pressure different from P to the first body and means for sending at least one flow of gas mixture at a pressure different from P to the second body. Preferably, (only) the first body is designed to be able to withstand high pressures and the apparatus includes means for sending at least one

liquide pressurisé à vaporiser.pressurized liquid to spray.

L'appareil peut comprendre des moyens pour soutirer le premier et/ou le 10 deuxième débit à un niveau intermédiaire du premier ou deuxième corps respectivement, des moyens pour envoyer ce(s) débit(s) vers une turbine et des  The apparatus may comprise means for withdrawing the first and / or the second flow at an intermediate level from the first or second body respectively, means for sending this (s) flow (s) to a turbine and

moyens pour envoyer le mélange détendu vers une colonne de l'installation.  means for sending the relaxed mixture to a column of the installation.

Selon un autre objet de l'invention, il est prévu une installation de séparation  According to another object of the invention, there is provided a separation installation

d'un mélange gazeux comprenant un appareil selon l'une des revendications 1 à 6, 15 un système de colonnes de distillation, des moyens pour envoyer un débit du  of a gas mixture comprising an apparatus according to one of claims 1 to 6, a system of distillation columns, means for sending a flow rate of the

mélange gazeux refroidi dans au moins un corps de l'appareil à une colonne du système et des moyens pour envoyer au moins un fluide provenant d'une colonne du  gas mixture cooled in at least one body of the apparatus to a column of the system and means for sending at least one fluid coming from a column of the

système à au moins deux des corps.  system to at least two of the bodies.

Selon un autre objet de l'invention, il est prévu un procédé de refroidissement 20 d'un mélange gazeux destiné à être séparé dans une installation de séparation par  According to another object of the invention, a method is provided for cooling a gaseous mixture intended to be separated in a separation installation by

distillation cryogénique dans un appareil d'échange comprenant au moins deux corps dans lequel un débit du mélange gazeux à séparer est envoyé à chacun des au moins deux corps à une même pression, un débit du mélange gazeux est soutiré à un niveau intermédiaire d'un premier corps et mélangé avec le débit à la même 25 pression qui s'est refroidi dans le deuxième corps.  cryogenic distillation in an exchange apparatus comprising at least two bodies in which a flow of the gas mixture to be separated is sent to each of the at least two bodies at the same pressure, a flow of the gas mixture is withdrawn at an intermediate level of first body and mixed with the flow at the same pressure which has cooled in the second body.

Selon d'autres aspects facultatifs: - le débit soutiré à un niveau intermédiaire du premier corps est envoyé à un  According to other optional aspects: - the flow withdrawn at an intermediate level from the first body is sent to a

niveau intermédiaire d'un deuxième corps o il poursuit son refroidissement.  intermediate level of a second body where it continues to cool.

- le débit soutiré à un niveau intermédiaire du premier corps est mélangé avec 30 un débit soutiré à un niveau intermédiaire du deuxième corps.  the flow withdrawn at an intermediate level from the first body is mixed with a flow withdrawn at an intermediate level from the second body.

L'invention sera décrite en plus de détail en se référant aux figures, qui sont  The invention will be described in more detail with reference to the figures, which are

des schémas d'appareils d'échange selon l'invention.  diagrams of exchange devices according to the invention.

Dans l'installation de la Figure 1, un appareil d'échange comprend un premier corps 1 et un deuxième corps 2. Un débit d'air 3 à la moyenne pression est divisé en  In the installation of Figure 1, an exchange device comprises a first body 1 and a second body 2. An air flow 3 at medium pressure is divided into

deux. Une partie de l'air 5 est envoyée à un surpresseur 13, est ensuite partiellement refroidie dans le deuxième corps 2, soutirée à un niveau intermédiaire de celui-ci et envoyée à une turbine d'insufflationl5. L'air détendu 17 est ensuite envoyé à la colonne basse pression d'une double colonne. Le reste 7 de l'air 3 est divisé en 5 deux. Une partie 9 se refroidit en traversant le deuxième corps 2 jusqu'au bout froid.  of them. Part of the air 5 is sent to a booster 13, is then partially cooled in the second body 2, drawn off at an intermediate level thereof and sent to an insufflation turbine 15. The expanded air 17 is then sent to the low pressure column of a double column. The rest 7 of air 3 is divided into 5 two. Part 9 cools down through the second body 2 to the cold end.

Le reste de l'air 11 est envoyé au premier corps 1 o il se refroidit jusqu'à un niveau intermédiaire et est envoyé ensuite à un niveau intermédiaire du deuxième corps 2.  The rest of the air 11 is sent to the first body 1 where it cools to an intermediate level and is then sent to an intermediate level of the second body 2.

L'arrivée de l'air 11 se trouve à au plus 20K, ou au plus 10K, de préférence au plus K de la température d'aspiration de la turbine 15. La température de l'aspiration de la turbine peut être plus élevée ou plus faible  The air inlet 11 is at most 20K, or at most 10K, preferably at most K of the suction temperature of the turbine 15. The suction temperature of the turbine may be higher or weaker

que la température d'entrée du débit i1.  than the inlet temperature of the flow i1.

L'air 11 poursuit son refroidissement dans le corps 2, se rejoint au débit 9 au bout froid de ce corps et est envoyé à la colonne moyenne pression de l'appareil de  The air 11 continues to cool in the body 2, meets at the flow rate 9 at the cold end of this body and is sent to the medium pressure column of the

séparation d'air.air separation.

Un autre débit d'air 19 à pression élevée se refroidit dans le premier corps et  Another air flow 19 at high pressure cools in the first body and

est détendu en aval du bout froid dans une vanne.  is relaxed downstream of the cold end in a valve.

Des débits d'azote liquide NL et l'oxygène liquide OL provenant de l'appareil  NL liquid nitrogen and OL liquid oxygen flow rates from the device

de séparation d'air, de préférence pompés à des pressions élevées, se vaporisent dans le premier corps 1. Un débit d'azote gazeux basse pression NG provenant de 20 l'appareil de séparation d'air s'y réchauffe.  separation air, preferably pumped at high pressures, vaporize in the first body 1. A low pressure nitrogen gas flow NG from the air separation apparatus heats up there.

Dans le deuxième corps, un débit d'oxygène gazeux basse pression OG, une autre partie de l'azote gazeux basse pression NG et un débit résiduaire basse  In the second body, a low pressure oxygen gas flow OG, another part of the low pressure nitrogen gas NG and a low residual flow

pression R provenant tous de l'appareil de séparation d'air se réchauffent.  pressure R all from the air separation unit warm up.

Il sera compris que tous les débits dans le premier corps 1, à part le débit d'air 25 11 et le débit NG, sont à pression élevée alors que tous les débits dans le deuxième  It will be understood that all the flows in the first body 1, apart from the air flow 25 11 and the flow NG, are at high pressure while all the flows in the second

corps sont à au plus la moyenne pression.  bodies are at most medium pressure.

Dans la Figure 2, l'installation comprend également un appareil d'échange à  In Figure 2, the installation also includes a heat exchange device

deux corps 1,2.two bodies 1,2.

Un débit d'air 3 à une pression supérieure à la moyenne pression est divisé en 30 deux. Une partie de l'air 5 est surpressée dans un surpresseur 13. Une partie de l'air surpressée est envoyée au premier corps 1 o elle se refroidit partiellement avant d'être détendue dans une turbine Claude 15. Le reste de l'air surpressé 107 est envoyé au bout chaud du deuxième corps 2 o il se refroidit partiellement avant d'être envoyé à la turbine Claude 15. L'air détendu 17 est envoyé à la colonne  An air flow 3 at a pressure higher than the medium pressure is divided into two. Part of the air 5 is boosted in a booster 13. Part of the boosted air is sent to the first body 1 where it cools partially before being expanded in a Claude 15 turbine. The rest of the boosted air 107 is sent to the hot end of the second body 2 where it cools partially before being sent to the Claude turbine 15. The expanded air 17 is sent to the column

moyenne pression d'un appareil de séparation d'air.  medium pressure of an air separation device.

Un débit d'air 109 formant partie du débit 3 se refroidit en traversant le premier corps, de même qu'un autre débit d'air haute pression 111. Les deux débits sont liquéfiés et envoyés à la séparation. Deux débits d'oxygène liquide à deux pressions élevées OL MP et OL HP se  An air flow 109 forming part of the flow 3 is cooled by passing through the first body, as is another high pressure air flow 111. The two flows are liquefied and sent to separation. Two liquid oxygen flows at two high pressures OL MP and OL HP are

vaporisent dans le premier corps 1.vaporize in the first body 1.

Dans le deuxième corps, un débit d'air 113 à la moyenne pression se refroidit et est envoyé à la colonne moyenne pression. Les débits NG et NG MP d'azote 10 gazeux provenant respectivement des colonnes basse pression et moyenne pression  In the second body, an air flow 113 at medium pressure cools and is sent to the medium pressure column. The flow rates NG and NG MP of nitrogen gas 10 coming respectively from the low pressure and medium pressure columns

se réchauffent dans le deuxième corps 2.  warm up in the second body 2.

Les corps 1 et 2 des deux Figures peuvent évidemment être composés de plusieurs éléments identiques d'échange thermique. Par exemple le corps 1 de la Figure 1 peut être composé d'une pluralité d'éléments identiques, chacun ayant une 15 entrée d'air moyenne pression, une entrée d'air haute pression, une entrée d'azote gazeux basse pression, une entrée d'oxygène liquide et une entrée d'azote liquide et  The bodies 1 and 2 of the two Figures can obviously be composed of several identical heat exchange elements. For example, the body 1 of FIG. 1 can be composed of a plurality of identical elements, each having a medium pressure air inlet, a high pressure air inlet, a low pressure nitrogen gas inlet, a liquid oxygen inlet and liquid nitrogen inlet and

des sorties respectives.respective outputs.

Claims (10)

REVENDICATIONS 1. Appareil d'échange de chaleur en amont d'une installation de séparation d'un mélange gazeux par distillation cryogénique comprenant au moins 5 deux corps d'échangeur de chaleur, des moyens pour envoyer un premier débit (11, 211) du mélange gazeux à un premier des au moins deux corps (1) à une pression P, des moyens pour envoyer un deuxième débit (5, 107) du mélange gazeux à un deuxième (2) des au moins deux corps à une pression P, des moyens pour envoyer les premier et deuxième débits de mélange gazeux refroidis à l'installation de 10 séparation, des moyens pour soutirer au moins deux fluides de l'installation de  1. Heat exchange device upstream of a separation installation of a gas mixture by cryogenic distillation comprising at least two heat exchanger bodies, means for sending a first flow (11, 211) of the mixture gas to a first of the at least two bodies (1) at a pressure P, means for sending a second flow (5, 107) of the gas mixture to a second (2) of the at least two bodies at a pressure P, means for sending the first and second cooled gas mixture flows to the separation installation, means for withdrawing at least two fluids from the separation installation séparation et des moyens pour envoyer au moins un de ces fluides au premier corps et au moins un de ces fluides au deuxième corps caractérisé en ce qu'il y a des moyens pour sortir le premier débit à un niveau intermédiaire du premier corps et des moyens pour mélanger ce débit avec le deuxième débit qui s'est refroidi dans le 15 deuxième corps.  separation and means for sending at least one of these fluids to the first body and at least one of these fluids to the second body characterized in that there are means for outputting the first flow at an intermediate level from the first body and means to mix this flow with the second flow which has cooled in the second body. 2. Appareil selon la revendication 1 comprenant des moyens pour introduire ledit premier débit (11, 211) de mélange gazeux, soutiré du premier corps (1), à un niveau intermédiaire du deuxième corps (2) et des moyens pour sortir le  2. Apparatus according to claim 1 comprising means for introducing said first flow (11, 211) of gas mixture, withdrawn from the first body (1), at an intermediate level of the second body (2) and means for removing the débit du mélange gazeux du deuxième corps.  flow rate of the gas mixture from the second body. 3. Appareil selon la revendication 1 comprenant une turbine de détente  3. Apparatus according to claim 1 comprising an expansion turbine (15) et des moyens pour y envoyer le deuxième débit (107) soutiré à un niveau intermédiaire du deuxième corps, la différence de température entre le niveau intermédiaire de soutirage du deuxième corps du débit destiné à la turbine et le niveau intermédiaire du premier corps du premier débit soutiré étant au plus 10K, de 25 préférence au plus 5K.  (15) and means for sending therein the second flow (107) withdrawn at an intermediate level of the second body, the temperature difference between the intermediate level of withdrawal of the second body of the flow intended for the turbine and the intermediate level of the first body of the first flow withdrawn being at most 10K, preferably at most 5K. 4. Appareil selon l'une des revendications précédentes comprenant des  4. Apparatus according to one of the preceding claims comprising moyens pour envoyer au moins un débit (19, 111) de mélange gazeux à pression différente de P au premier corps (1) et des moyens pour envoyer au moins un débit  means for sending at least one flow (19, 111) of gas mixture at a pressure different from P to the first body (1) and means for sending at least one flow (9, 113) de mélange gazeux à pression différente de P au deuxième corps (2).  (9, 113) of a gas mixture at a pressure different from P to the second body (2). 5. Appareil selon l'une des revendications précédentes dans lequel le  5. Apparatus according to one of the preceding claims wherein the premier corps (1) est conçu pour pouvoir supporter de fortes pressions et  first body (1) is designed to be able to withstand high pressures and comprenant des moyens pour y envoyer au moins un liquide pressurisé à vaporiser.  comprising means for sending therein at least one pressurized liquid to be vaporized. 6. Appareil selon l'une des revendications précédentes comprenant des  6. Apparatus according to one of the preceding claims comprising moyens pour soutirer le premier et/ou le deuxième débit (107, 211) à un niveau intermédiaire du premier ou deuxième corps respectivement (1, 2), des moyens pour envoyer ce(s) débit(s) vers une turbine (15) et des moyens (17) pour envoyer le  means for withdrawing the first and / or the second flow (107, 211) at an intermediate level of the first or second body respectively (1, 2), means for sending this (s) flow (s) to a turbine (15) and means (17) for sending the mélange détendu vers une colonne de l'installation.  relaxed mixture to a plant column. 7. Installation de séparation d'un mélange gazeux comprenant un 5 appareil selon l'une des revendications 1 à 6, un système de colonnes de distillation, des moyens pour envoyer un débit du mélange gazeux refroidi dans au moins un corps de l'appareil à une colonne du système et des moyens pour envoyer au moins  7. Installation for separating a gaseous mixture comprising an apparatus according to one of claims 1 to 6, a system of distillation columns, means for sending a flow of the cooled gaseous mixture into at least one body of the apparatus to a system column and means to send at least un fluide provenant d'une colonne du système à au moins deux des corps.  fluid from a system column to at least two of the bodies. 8. Procédé de refroidissement d'un mélange gazeux destiné à être 10 séparé dans une installation de séparation par distillation cryogénique dans un  8. Method for cooling a gas mixture intended to be separated in a separation installation by cryogenic distillation in a appareil d'échange comprenant au moins deux corps (1, 2) dans lequel un débit du mélange gazeux (9, 11, 107, 211) à séparer est envoyé à chacun des au moins deux corps à une même pression, un débit du mélange gazeux (11, 211) est soutiré à un niveau intermédiaire d'un premier corps et mélangé avec le débit à la même pression 15 qui s'est refroidi dans le deuxième corps.  exchange device comprising at least two bodies (1, 2) in which a flow of the gaseous mixture (9, 11, 107, 211) to be separated is sent to each of the at least two bodies at the same pressure, a flow of the mixture gas (11, 211) is drawn off at an intermediate level from a first body and mixed with the flow at the same pressure which has cooled in the second body. 9. Procédé selon la revendication 8 dans lequel le débit soutiré (11) à un niveau intermédiaire du premier corps (1) est envoyé à un niveau intermédiaire d'un  9. The method of claim 8 wherein the withdrawn flow (11) at an intermediate level of the first body (1) is sent to an intermediate level of deuxième corps (2) o il poursuit son refroidissement.  second body (2) where it continues to cool. 10. Procédé selon la revendication 8 dans lequel le débit (211) soutiré à 20 un niveau intermédiaire du premier corps (1) est mélangé avec un débit (107) soutiré  10. The method of claim 8 wherein the flow (211) withdrawn at an intermediate level from the first body (1) is mixed with a flow (107) withdrawn à un niveau intermédiaire du deuxième corps (2).  at an intermediate level of the second body (2).
FR0350905A 2003-11-25 2003-11-25 Heat exchange apparatus upstream of cryogenic gas distillation plant has outlet to extract first flow from intermediate level in first body Pending FR2846077A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006069983A1 (en) * 2004-12-30 2006-07-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Assembly of heat exchangers and a cryogenic distillation apparatus incorporating the same
FR2947042A1 (en) * 2009-12-10 2010-12-24 Air Liquide Air cooling method for air separation apparatus, involves expanding fluids, sending expanded fluids to level of exchanger, and prohibiting passage of expanded fluids to level of another exchanger
CN102155841A (en) * 2010-02-11 2011-08-17 普莱克斯技术有限公司 Cryogenic separation method and apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006069983A1 (en) * 2004-12-30 2006-07-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Assembly of heat exchangers and a cryogenic distillation apparatus incorporating the same
FR2880418A1 (en) * 2004-12-30 2006-07-07 Air Liquide Heat exchanger assembly for use with cryogenic distillation apparatus has two series of heat exchangers, stacked in vertical direction
FR2947042A1 (en) * 2009-12-10 2010-12-24 Air Liquide Air cooling method for air separation apparatus, involves expanding fluids, sending expanded fluids to level of exchanger, and prohibiting passage of expanded fluids to level of another exchanger
CN102155841A (en) * 2010-02-11 2011-08-17 普莱克斯技术有限公司 Cryogenic separation method and apparatus

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